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Half charge in 20 minutes – that's how fast the iPhone Duo charges via cable. However, a power adapter isn't included, and Apple's terms and conditions for using one aren't entirely consistent. If you choose a compatible power adapter, you don't need to worry about this.
The iPhone Duo has been available since October 23rd. The box contains only a one-meter USB-C charging cable in addition to the device; the power adapter must be purchased separately. Apple specifies which power adapter is required for the Duo to achieve the promised charging time in the support document "Fast charging iPhone" and in the iPhone Duo technical specifications. All other details, prices, and release dates can be found on the iPhone Duo facts page.
Key Facts at a Glance
- The iPhone Duo charges to about 50 percent in approximately 20 minutes via cable, and wirelessly via MagSafe in about 30 minutes.
- You will need the included USB-C cable and a power adapter that can deliver 60 watts – Apple's dynamic 40W power adapter does the job.
- The support document additionally requires an adjustable voltage supply (AVS) and USB-PD 3.2, but the datasheet does not mention this requirement.
- MagSafe requires a power adapter of 35 watts or more, while the Duo can charge wirelessly with up to 25 watts.
- Compared to the iPhone 18 Pro, the Duo takes five minutes longer via cable; wirelessly, both are equally fast.
What Apple charges for fast charging
For wired charging, Apple specifies two requirements: the included USB-C cable and a power adapter capable of delivering 60 watts. Under these conditions, the battery will be half-charged in approximately 20 minutes. Wireless charging, using a MagSafe charger and a power adapter of at least 35 watts, takes around 30 minutes.
| Charging route | Accesories | Power supply | Up to 50 percent |
|---|---|---|---|
| USB-C cable | Cables included in the package | 60W capable, according to the support document with AVS and USB-PD 3.2 | about 20 minutes |
| MagSafe | MagSafe charger | from 35 W | about 30 minutes |
Apple conducted the measurements with completely discharged devices, specifically in the open position. The timer starts from the moment the Apple logo appears during startup. For both methods, Apple used its own dynamic 40W power adapter, which can briefly deliver up to 60W.
According to Apple, fast charging may not work if the temperature is too hot or too cold. The power output of an existing Apple power adapter is indicated on its top or bottom.
The datasheet and support document differ from each other
The two Apple sources describe the power supply differently. The datasheet requires a power supply that delivers at least 60 watts and refers generally to USB-PD power supplies in the footnote. The support document goes further: A third-party power supply should deliver 60 watts or more, utilize the AVS adaptive voltage supply, and support USB-PD 3.2.
According to Apple, AVS means that the power adapter precisely adjusts the voltage for more efficient charging. Apple's dynamic 40W power adapter supports this, which is why it meets both standards despite the "40" on the label. For a power adapter from another manufacturer, AVS support is the crucial factor – the wattage alone doesn't tell you anything about it.
Apple requires the same power adapter for the iPhone 18 Pro. Anyone who has already purchased a compatible power adapter for the iPhone 18 Pro can continue to use it for the Duo.
Five minutes longer than the iPhone 18 Pro
Using the same power adapter, the iPhone 18 Pro reaches 50 percent in about 15 minutes, according to Apple, while the iPhone Duo takes about 20 minutes. Wirelessly, both charge in about 30 minutes.
| Model | Cables up to 50 percent | MagSafe up to 50 percent | Battery (EU model) |
|---|---|---|---|
| iPhone Duo | about 20 minutes | about 30 minutes | 4,883 mAh |
| iPhone 18 Pro | about 15 minutes | about 30 minutes | 4,056 mAh |
The percentage figure refers to different battery sizes. According to the EU data sheet, the iPhone Duo has 4,883 mAh, which is about 20 percent more capacity than the iPhone 18 Pro sold in this country. The Duo also uses two batteries instead of one, as Apple states in the technical specifications.
Wireless via MagSafe and Qi2
For fast wireless charging, Apple recommends its own MagSafe charger with a power adapter of 35 watts or more. According to the specifications, the device can wirelessly charge at up to 25 watts, both via MagSafe and Qi2. However, Apple only specifies a charging time of 30 minutes to 50 percent for the MagSafe charger.
Apple conducted the measurements using the current MagSafe chargers with Qi2 25W support at lengths of one and two meters. A 30-watt power adapter, which was sufficient for the MagSafe charger of an iPhone 17, falls below the stated limit for the Duo.
How much accessories cost at Apple
If you don't have anything suitable at home, you can find everything directly from Apple. In Germany, the prices are:
| Accesories | Price at Apple |
|---|---|
| 40W Dynamic Power Adapter with 60W Max | 45 euros |
| MagSafe charger (1 m) | 49 euros |
| MagSafe charger (2 m) | 59 euros |
| 60W USB-C charging cable (1 m) | 19 euros |
The cable is only needed if the included one is missing or a second one is required. Apple's power adapter and MagSafe chargers are also available in Amazon's collection of iPhone Duo accessories. MacBook owners often already have a more powerful power adapter – the MacBook power adapter overview shows the wattage of each model. However, whether it supports fast charging with the Duo also depends on AVS support.
For whom is owning your own power supply worthwhile?
I consider the €45 power adapter the obvious choice for the iPhone Duo, especially since the two Apple sources don't specify the same requirement. It's the device Apple itself used for testing, and it meets both the specifications in the datasheet and the stricter requirements in the support document. With a power adapter from another manufacturer, however, you first have to check whether AVS is explicitly mentioned.
Those who charge the Duo overnight don't need either of these. The 20 minutes only matter if you need a quick charge – before leaving for a trip or between appointments. For everyone else, MagSafe is the more convenient solution, and many existing power adapters can deliver the 35 watts it requires. Further ways to reduce charging times can be found in the tips for faster charging on the iPhone. All articles about the foldable iPhone are collected on the iPhone Duo topic page.
Fast charging for iPhone Duo – the most important information at a glance
Fast charging for the iPhone Duo means using the included cable, a 60-watt power adapter, and ideally one with AVS (Automatic Charging Protection). With this method, the battery will be half full in about 20 minutes; using MagSafe at 35 watts, it will take about 30 minutes. Apple's own dynamic power adapter covers both charging times.
Are you using an existing power adapter for your iPhone Duo, or are you buying Apple's 40W model? Let us know in the comments which power adapter you're using with your Duo.
Frequently Asked Questions: Fast Charging iPhone Duo
It charges to about 50 percent in approximately 20 minutes via cable, and wirelessly via MagSafe in about 30 minutes.
No. The box only contains a one-meter-long USB-C charging cable.
One that can deliver 60 watts. According to Apple's support document, it should also support AVS adaptive voltage and USB-PD 3.2. Apple's dynamic 40W power adapter with a maximum output of 60W meets both requirements.
The iPhone Duo charges this way, but not as quickly as Apple claims. It requires 60 watts via cable and at least 35 watts via MagSafe.
Charging via cable takes about 20 minutes to reach 50 percent instead of 15, but it has a larger battery. Wirelessly, both charge to 50 percent in about 30 minutes.
Yes. According to the data sheet, it charges via Qi2 as well as via MagSafe at up to 25 watts. However, Apple only mentions the 30-minute charging time to 50 percent for its own MagSafe charger.
Yes, the iPhone Duo will charge with it. However, according to the support document, the power adapter must support AVS for full speed. The wattage rating on the power adapter doesn't indicate this.
